Consider two wheels with fixed hubs. the hub cannot move, but the wheel can rotate about it. the hubs are fixed to a stationary object. the hubs and spokes are massless, so that the moment of inertia of each wheel is given by i = mr2 , where r is the radius of the wheel. each wheel starts from rest and has a force applied tangentially at its rim. wheel a has a mass of 1.0 kg, a diameter of 1.0 m, and an applied force of 1.0 n. wheel b has a mass of 1.0 kg and a diameter of 2.0 m. the two wheels undergo identical angular accelerations. what is the magnitude of the force applied to wheel b?

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?